Re: [xsl] Map duplicate handling differences

["Michael Kay mike@xxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

This shortcoming of xsl:map has been noted:

https://github.com/qt4cg/qtspecs/issues/169

Saxon 11 with XSLT 4.0 enabled already supports the proposed on-duplicates
attribute, for example

<xsl:map on-duplicates="function($x, $y){$x}">

which achieves the effect of use-first in map:merge.

Michael Kay
Saxonica

On 9 Dec 2022, at 16:08, Martin Honnen
martin.honnen@xxxxxx<mailto:martin.honnen@xxxxxx>
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx<mailto:xsl-list-service@xxxxxxxxxxxx
rytech.com>> wrote:


Am 12/9/2022 um 4:51 PM schrieb Michael Mueller-Hillebrand
michael.mueller-hillebrand@xxxxxxxxx<mailto:michael.mueller-hillebrand@docufy
.de>:
Hello Friday folks,

I have noticed that the duplicate handling when constructing maps is different
and I would like to understand the reason.

When using <xsl:map> with <xsl:map:entry> the transformer rejects duplicate
keys with a runtime error.

<xsl:variable name="pairsMap" as="map(xs:string, xs:string)">
    <xsl:map>
       <xsl:for-each select="tokenize($pairsString, ';')">
            <xsl:map-entry key="substring-before(., '=')"
select="substring-after(., '=')"/>
        </xsl:for-each>
    </xsl:map>
</xsl:variable>

When using map:merge() without any extra options it uses duplicates:use-first
(I learned I can turn on brejectb or buse-lastb or bcombineb):

<xsl:variable name="pairsMap" as="map(xs:string, xs:string)"
        select="map:merge(
            for $t in tokenize($pairsString, ';')
                return map:entry(substring-before($t, '='),
substring-after($t, '=')))"/>

Have I overlooked a way to define options in the xsl:map case?
Or is this a subtle way to get us to move to inline XPath?



XSLT 4 is going to remedy that shortcoming, see
https://qt4cg.org/specifications/xslt-40/Overview-diff.html#duplicate-keys and

<!-- Category: instruction -->
<xsl:map
  on-duplicates? = expression >
  <!-- Content: sequence-constructor -->
</xsl:map>

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